Safety stop mechanism



Marh 15, 1927. 1,621,442

J. w. THROPP-- SAFETY STOP MCHANISM l originan Filed Aug. 26. 1925 1 5 sheets-sheet 1 l 192 March 5 7 .1. w. 'rHRoPP SAFETY STOP MECHANISM Original Fild Aug. 26. 1925 5 Sheets-Sheet 2 March' 1s, 1921. 1,621,442

y J. W. THROPP4 SAFETY STOP MECHANISM l Qrigina] Filed Aux. 26, 1925 5 Sheets-Sheet .'5

March 15,1927. 1,621,442

J. W. THROPP SAFETY STOP MECHANI SM Origina? Filed Aug. 26. 1925 S'Sheets-Sheet 4 -v @M5L n@ March 15, 1927. J. w WRO-PP SAFETY STOP MECHANISM 5 Sheets-Sheet 5 Jogg-D T Original Filed Aug. 26, 1925 i SAFETY? "gaetan-ism; having the' eine genera-iwmahlnesoffthis eleotrioal" connections forthisgfpiirposef. The

described in my 'PatentNoh:1,490,788; dated *peaiauariy ap exposed L'rllr's, 'the-operato; b f rubber mixing;machinereonstitutes exemple-. lewin" I avoidthj use? of the; mathemati connes# Varent.,Y 'O her objects f "af arent from PIX Vide anv electrically 'controlled-L l and grayitf 'ally operated brake mechanism whiGhiS'en-.-

use a' inimumLof Cur- ;the renewing" Speeia'aen *ISH-fthe? aCQQmranyina.drainage' have Athe embodiment fof the invention drawings are for illus-V trative purposes only and that Various 'ohaiiges and substitutions A f tion.

-Fig l .is a froii-Uyiew of maohine`- hailing the invention incorporated therein.v i

zontal mixing r 55 gi iiles:arriecl by vertically extending hous- .z Fig. 3 is an. enlarged detail-' elevational; viewjshowing the .brake .apparatus towhioh= thefinyention partioiilarly relates.

Fig. .4L-is a V plan vien,Tv illustrating some fis! 2L diagram off electrical oo niiefcf`v tions. Y

' Rfepfmgfparticularly@ Figs.; aad 2j of the drawings 1'4 and 2 represent .horiev ollers Whioli are joiirnalecl' VrespectVely in hearing boxes 3 ande. The

beariiigboxes 4: are horizontally slida'ble 'in relates to; a 'j safety` stop i;

joli

ith the'. presri iriveilqzi,

@if theziliveneonl wigliibe ver 2O carries for tlifis purpose 'aj ro as 1 shownit in sitioned .wallsof a supportingfdevi'c'e 19" other oi the brake `ari r 1 2Q* Carr-ies* an? adjustable weightfwhidh :ends .te more,... .the brake arm 20' finto ythe ol'otltefl'v line posif on shown f'in atv ytri-l'iioh' positionv the Patente-d lViaix 15,1y 19277.fy( i c Y grosarirwmiiaoielzoi* E Nfrgoiyivnw; fri

'hr'akefbandf'friotioiially'engages the brake.

' In lordertofresist 'th'efaotfioii lef the eentric with'th pivotal azi-iis et' 2.52y and h eonceiitre surface cioperates AWlth;

able Supporting sans assolate a with law 23,'f1fpiVide" a suitable Vlfatoli. levicef 24j which is 'mounted for' imoemeit about @horizontal Pivotal rin. 25.. :The lath'. devi@ f2.4 ipi'eierment oltheile'yer '20'.' f e l preferablygprovide 'means normally "tend-v ing to 'moyel'the latch dev-ice 24 inV the olok- Wise direotioiiz'so 21S/ t0 release the rollei""27 and thusy permit the brake lto be:eiijgafged '0r Set by *iehtfr 'filly' Suitable means `may be provided for this purposelbut I prefer to employ "a lever arm 28l preferably formed integrally with the` latch device. This lever arm and the parts associated ,therewithv are sufficiently heavy to'v move lthe latch device as described. I providemeans for holding the latch device in itsop'erative or left hand position, .this means preferably being electro-magnetic. As illustrated there is a solenoid 29 having acore 30'which is preferably directly pivoted to the lever ,farm 28.-. TheV constructionof the solenoid isisuch-'that when it is energized the core fdrawn upward thus movingzthe latch device ing it in its left hand or operative position.

in thecounter-clockwise direction and holdi, l/Vhen the solenoidfis deenergized'the weight of the lever28 vand of tlieicore 301will move the 'latch device*v the clockwise direction :thus-releasingthe roller 27 and permitting '.the :weight 23 to dropy and apply-the brake.

*QFor controlling the current through the Ysolenoid 29,'I provide one, and preferably two, switches, 31, 31.'V llVhen two switches are provided they are arranged in series.

As shown in Figs. 1 and 2 these switches are mixing machine.

mountedon standards 32, 32 ontop of the i Connected with the Vre spective switches are two pivotally mounted horizontal rods 33,33 whichare normally'- Lheld in the/positions shown in Fig. 2, these positions corresponding toy theclosed ,posi-v ,tions-of the switches. Incase ofranyaccident-or emergency'requiring the machine to be` quickly stoppedeither .of the rods 33, 33

maybe moved downward tothus openthe correspondingswitch 31 Vand deenergize the` solenoid 29.

The various lelectrical connections are shown in'Fig. 5 vwherein the two switches y 31, 31 are shown as vbeing in series with they` .solenoid 29.-. ItA fwill be clear that when either of these switches is operated the solenoid 29V will be deenergiz'ed as described,

thus causing the brake to be applied,

fipreferabiy provide a. switch-si what is' connected with the brakeleverf20 so asto `r Vbe closed when thelever is in `its upper position' andfopened-when the lever isfin its lower` position. The construction yand the mounting of this switch are substantially thel same as shown and described in my aforesaid patent. As shown in Fig. 5, this switch 34 is connected in-.parallel with the solenoid 29; Connected in series with 'the' .switch- 34 isv the undervoltage coil 3.5 ofa i 'circuit breaker 36. Thiscircuit breaker is connected in series with the Vcircuit-of the i motory 14. It will be clear "that-the opening i of either of theswitches 31, 31 will not only i deenergize the solenoid 29l and cause the brake to be set, but will also cause the undervoltage circuit breaker 36 to open and thus stop the motor 14. The settingof the kbrake Vcauses the switch 34 to open'l and this makes start.

it impossible for the motor to be again started untilfafter the brake mechanism has been manually released. The switches 31, '31"aft`er being opened will ordinarily. be

closed" again "but iti'will b e clear that this action willmnot cause the machine to again Even if the operator should attempt tov close the circuit breaker 36 this circuit breakern would iinmediately'reopen for the reason thatvthe circuit of the` coil V35 remains broken until the brake mechanism" has been released, thusclosingttheswitch 34" What I claim` is: 4 Y

, 1. The combination Ywith al Apowertshaft toi be controlled and la'V sourceof power there-` for, of abrake apparatus yassociated with the said power shaft, means normally tend- .ing to move the 4brake apparatus into set iosition a ivoted latch 'device having a. l a D surfacel concentric with itsv pivotalV axis,

means` adapted tol be engagedvbythe said concentricsurface for resisting the move-y ment of the brakeapparatus into set` position, and` kan electro-magneticn device for causing themovement of thesaid latchHvdevice to disengage the concentric surface from the lastr saidjmeans and thus permit the brake apparatus torbeV moved intofset position. i v

2. The lcombination withfa power shaft be controlled-'and a sourceof power therefor, of a brake Vapparatus associated `4with fthe saidk power shaft,l av weight,noriiiallyl tending to move the brake apparatus. into set position, ahorizlontally pivoted `latch deviceV havinga surface-concentric with .its

pivotal ka-Xis, means associatedf'with fthe weight and adapted tobe engaged byfthe said concentric surface to support ,the Y i weight, and an electro-magnetic devicel for causing the movement of the said latch Idevice to disengage'A the `concentric surface from the weight 'supporting means and thus permit the brake apparatuspvto be movedLV tion, a horizontally pivoted latch' device having a surface concentric with `its Vpivotal axis, means associated with the weight and adapted to be engaged by the said concentric s surface tosupport the weight, means nor- -mally tending to move the latch device into positionto `disengage the weight supporting means, and al solenoid adapted whenv engaged toV hold the Vvsaid device inposition tok engage vthe weight supporting device.y

4. The combination with a power shaft to be controlled and a source V,of power there- Vfor, o f` a brake apparatus associated with the said power shaft, means normally ltend-V ing Vto move the brake apparatusinto set position, latch device adapted when in onefrrise'ries ywifiththelvsole'noid, and a inotoi' conl Y v.position to resist the 4action of the lastisaidv vtrolling oicuit" in serie'swith the said switch Y v means and provided With;n1eans normally `and* inparalle'l with the' Solenoid, the said- 10 i tending to move itk out ofthe said position, circit inoluding a 'switchzwhich is` closed'` v 5 a solenoid'adapted When energized to fhold 'when thebrakeapparatiieis released and thev said latch device in its said operative open when thejbrake apparatus is set, Y, position, afmanuall'yf operable, switch lin 1 Y JOSEPH VSL"TIIROPPI-V 

